PHP8 supported

Merge pull request #19 from phramework/php8_version

Added php8 as supported required php version

Drop external dependencies

0.0.5-p1

Fixed phpunit configuration (#15)

Fix typo in range utility method

0.0.4

Upgrade to PHPUnit 6.x

Fix range utility function behaviour with null

Range input item null should return always false

Fix bug in language library function range

Fix bug in range library function

Fixes #3

0.0.0-dev

Release dev version 0.0.0